[Letter from D. W. Kempner to W. J. Sheridan, July 22, 1953], letter, July 22, 1952; (https://texashistory.unt.edu/ark:/67531/metapth1383249/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .